The Sexual Experiences Long Form Perpetration (SES-LFP)

Author of Tool: 

Mary P. Koss, Antonia Abbey, Rebecca Campbell, Sarah Cook, Jeanette Norris, Maria Testa, Sarah Ullman, Carolyn West, and Jacquelyn White

Key references: 

Koss, M.P. Abbey, A., Campbell, R., Cook, S., Norris, J., Testa, M., Ullman, S., West, C., & White, J. (2006). The Sexual Experiences Long Form Perpetration (SES-LFP). Tucson, AZ: University of Arizona.

Koss, M.P., Abbey, A., Campbell, R., Cook, S; Norris, J., Testa, C., Ullman, S., West, C., & White, J. (2007). Revising the SES: A collaborative process to improve assessment of sexual aggression and victimization. Psychology of Women Quarterly, 31, 357-370.

Koss MP, Gidycz CA. Sexual Experience Survey: reliability and validity. Journal of Consulting and Clinical Psychology 1985;53:422–423.

Koss MP, Gidycz CA, Wisniewski N. The scope of rape: incidence and prevalence of sexual aggression and victimization in a national sample of higher education students. Journal of Consulting and Clinical Psychology 1987;55:162–170.

Koss MP, Oros CJ. Sexual Experience Survey: a research instrument investigating sexual aggression and victimization. Journal of Consulting and Clinical Psychology 1982;50:455–457.

Primary use / Purpose: 

The Sexual Experiences Survey Long Form Perpetration (SES-LFP) is a widely used measure of sexual aggression among male offenders and female victims. Specifically, it aims to capture the factors linked to any degree of sexual assault perpetration. It contains 20 items or statements concerning with various degrees of coercion, threat, and force. Mutually exclusive categories were developed for each level of sexual assault including non-perpetrator, sexual coercion, sexual contact, attempted rape and rape. High Scores indicate greater sexual aggression.

Background: 

The Sexual Experiences Survey (SES) was originally developed in the late 1970s (Koss & Oros, 1982) aiming to serve as a measure of prevalence, selection tool, predictor variable, and outcome measure in psychological, criminological, and health research settings.

Psychometrics: 

Reliability and Validity of the SES are reported in Koss and Gidycz (1985).

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